Malicious PDF — malware analysis report

Static analysis result for SHA-256 1538111723565524…

MALICIOUS

PDF

76.3 KB Created: 2021-05-13 22:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 56f8ce65eaefde9cb5be02268e095523 SHA-1: 12dba920e4849ee5468e22825baae3cd6a4f1d19 SHA-256: 15381117235655243b64abf1900efc874fe87e74c81d240be4e012ca5bda30ee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=can+you+reset+a+vizio+remote PDF link annotation
    • https://cdn.sqhk.co/jevamivuvugi/dhaibPj/84626737656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_6019a81ac472d.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/3ClqHIp/sim_dashboard_pc.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/9155380309.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/konusolo.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/taxak.pdfIn PDF document text
    • http://negifowutagur.mygamesonline.org/tekogezorit.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/jehigid/pisubisuza.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/hnxgg9s/nasiroro.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/Ghiegek/father_and_son_raleigh_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/rurizibaxami/2hbcSOv/shooty_skies_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/hgcWjdq/ant_farm_with_queen_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_60170833686c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wiwosotu.myartsonline.com/difujedidup.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_c0865fe4dbe3420ca3270e57d0d43655.pdf?index=trueIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/kpmg_enterprise_risk_management.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_4c241a27083c414794931ae705ce798d.pdf?index=trueIn PDF document text
    • http://nakixaxev.myartsonline.com/coronary_artery_disease.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/what_are_the_aspects_of_filmmaking.pdfIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_c630b0bcbd6f48b39e7ea1089d5ea515.pdf?index=trueIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_e265b85cdd024b03946d537816b91a6e.pdf?index=trueIn PDF document text
    • http://wegorabeg.atwebpages.com/lolulukif.pdfIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_7d71f2cf8de84ae99a1e2e2a560b4f54.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 4916 bytes
SHA-256: f1b107ca8bae3b8115f58860cf88559476fb8e4f9d5c755c98dfa091a4b9e1dc
font_01_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10832 bytes
SHA-256: a6bd955d1f53c60285945560c6cd0f4a7fd3526acf78ffb96f7e2d16d25799cc
font_02_sfnt_off0001158b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361